Can someone explain the merits of "Double Coat on Optical Low Pass filter"?

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kbrkr
kbrkr Senior Member • Posts: 1,612
Can someone explain the merits of "Double Coat on Optical Low Pass filter"?

I've never heard of double coating on an Optical Low Pass Filter.  What is it's purpose and why is it a benefit; which Nikon seems to be keying on.

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